6th edition, 8.53

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Hai-Lin Yeh 1J
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6th edition, 8.53

Postby Hai-Lin Yeh 1J » Thu Feb 07, 2019 10:34 am

8;53 The reaction of 1.40 g of carbon monoxide with excess water vapor to produce carbon dioxide and hydrogen gases in a bomb calorimeter causes the temperature of the calorimeter assembly to rise from 22.113 C to 22.799 C. The calorimeter assembly is known to have a total heat capacity of 3.00 kJ·(C-1). (b) Calculate the internal energy change, deltaU, for the reaction of 1.00 mol CO(g). Can someone explain why we do not use 1.00 mol CO (g) and we use 1.40 g instead? Isn't the reaction for 1.00 mol CO?

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Re: 6th edition, 8.53

Postby Chem_Mod » Thu Feb 07, 2019 12:51 pm

The 1.4 g of CO is less than 1 mol, so you want to find the reaction enthalpy of using 1.4 g of CO and then figure out what the enthalpy is if 1 mol of CO is reacted.

Hai-Lin Yeh 1J
Posts: 89
Joined: Fri Sep 28, 2018 12:16 am
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Re: 6th edition, 8.53

Postby Hai-Lin Yeh 1J » Thu Feb 07, 2019 1:21 pm

But in the answer key, they only used 1.40 g. It never mentions 1.00 mol CO. So why do we disregard 1.00 mol?


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